I think Sandy is referring to the rifle and not the silencer which is a separate issue. We know the silencer was used on the gun and then replaced in the cupboard with the sights by the murderer who thought that they would not be inspected. Unfortunately for him they were inspected and though and behold, Sheila's blood was found in the baffles with the speck of paint which matched the hearth surround.
Total nonsense Mike, the blood was found before the rifle was test fired and in any event, blood would not attach itself to a sound moderator in such a way. It is a known fact that only low back pressure could cause blood to be deposited in a sound moderator between the baffles.
There was no blood, no gun oil or powder residue on her hands other then the small amount you can see for yourself on the above photo.
It is interesting that the outer backing to the Bible has no blood on it. How on earth was Sheila supposed to hold it...with her teeth??